CN101161686A - Method for preparing immunopotentiator beta-dextran - Google Patents
Method for preparing immunopotentiator beta-dextran Download PDFInfo
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- CN101161686A CN101161686A CNA2007100316358A CN200710031635A CN101161686A CN 101161686 A CN101161686 A CN 101161686A CN A2007100316358 A CNA2007100316358 A CN A2007100316358A CN 200710031635 A CN200710031635 A CN 200710031635A CN 101161686 A CN101161686 A CN 101161686A
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Abstract
The present invention relates to a process for preparing an alkali-indissoluble beta-dextran which is characterized in that the yeast cell wall gotten from the fresh microzyme or the dry yeast powder or the scrap yeast cell wall after distilling the yeast is to be suspended uniformly by 0.70-0.80 mol/l of NaOH solution, to be heated to boil for 15-20min, to be cooled, and then to be centrifugated at 3000-4500r/min to get the deposition. The deposition is to be suspended uniformly by 0.70-0.80 mol/l of NaOH solution, to be heated to boil for 15-20min, to be cooled to 65-80 degree C, to be kept for 12-18h at a constant temperature. And then the pH of the cooled solution is adjusted to be 4.0-5.0 using HCl. And then the solution is centrifugated at 3000-4500r/min to get the deposition which is suspended uniformly by distilled water, to be boiled for 8-15min and to be centrifugated at 3000-4500r/min to get the deposition, which is repeated for twice to three times. Then the product is obtained after the water is getting rid of. The invention has a simple process, a samll equipment invest and a high product purity. The invention also raises the value in use of the scrap yeast residue, and has a bright using future.
Description
Technical field
The present invention relates to a kind of preparation method of dextran, relate to the preparation method of the insoluble beta-glucan of a kind of alkali specifically.
Background technology
Dextran is present in the fungal cell walls such as yeast, is the polymkeric substance of D-glucose.The insoluble beta-glucan of alkali is a kind of good biological immunomodulator, is widely used in industries such as food, medicine.The method for preparing the insoluble beta-glucan of alkali at present both at home and abroad mainly is the method that enzyme process, Sevage method, acid system or acid system combine with organic solvent, and these methods cut both ways: enzyme method technique is complicated and dextran purity that extract is not high; Acid system can make equipment be corroded, and also contains mannosans in the product, and the purity of dextran is not high yet; The Sevage method only is applicable to the extraction water-soluble glucan.
Summary of the invention
The objective of the invention is to develop a kind of method that can obtain the insoluble beta-glucan of highly purified alkali.
We are raw material with the yeast cells wall, extract the insoluble beta-glucan of alkali that obtains with diluted alkaline and do not contain mannosans, so purity is very high, thereby realized purpose of the present invention.
The preparation method of the insoluble beta-glucan of a kind of alkali of the present invention, its feature comprises the steps:
(1) yeast cells wall is evenly suspended with 0.70～0.80mol/L NaOH solution, heated and boiled keeps 15～20min, cooling, and 3000～4500r/min is centrifugal, and the supernatant that goes obtains precipitation;
(2) precipitation that step (1) is obtained evenly suspends with 0.70～0.80mol/L NaOH solution, heated and boiled keeps 15～20min, is cooled to 65～80 ℃ again, and constant temperature keeps 12～18h, the cooling back transfers the centrifugal supernatant that goes of pH to 4.0～5.0,3000～4500r/min to obtain precipitation with HCl;
(3) after the precipitation that step (2) is obtained evenly suspends with distilled water, boil 8～15min, 3000～4500r/min is centrifugal, and the supernatant that goes obtains precipitation, and this process repeats 2～3 times, removes moisture, obtains product.
The described yeast cells wall of step (1) can be by suspending bread yeast (Baking yeast), cereuisiae fermentum fresh yeast thalline such as (Brewingyeast) or dried yeast powder again, making cell rupture remove inclusion after self-dissolving or the enzyme-added processing obtains, perhaps directly adopt yeast to extract depleted yeast slag---yeast cells wall after the inclusion, the yeast cells wall that obtains can also further be removed residual water soluble components such as cell content 1～2 time with the distilled water centrifuge washing, obtains purer yeast cells wall.
The described precipitation of step (3) can adopt vacuum-drying, lyophilize or remove moisture with methods such as dehydrated alcohol, anhydrous diethyl ether gradation dehydration are air-dry then, preferably adopts lyophilize to remove moisture.
Raw material sources of the present invention are extensive, and technology is simple, and facility investment is few, the product purity height does not contain mannosans, can avoid in the acid system acid to the corrosion of equipment with to the infringement of workers ' health, can also improve the utility value of waste yeast slag in addition, thereby the present invention has a good application prospect.
Description of drawings
Fig. 1: sample infrared absorption pattern.
Fig. 2: standard β-(1,3) dextran sample infrared absorption pattern.
Embodiment
Following examples are to further specify of the present invention, are not limitations of the present invention.
Embodiment 1:
Yeast is extracted yeast slag 30g after the inclusion, and 1000mL evenly suspends with distilled water, and centrifugal 15 minutes of 4000r/min goes supernatant to precipitate, and repeats once above-mentioned suspended centrifugal step and obtains pure yeast cells wall.
Is that the NaOH solution of 0.75mol/L evenly suspends with pure yeast cells wall with 1000mL concentration, heated and boiled keeps 15min, the centrifugal 15min of cooling back 4000r/min, remove supernatant liquor, precipitation suspends with the NaOH solution of 1000mL concentration 0.75mol/L again, and heated and boiled keeps 15min, is cooled in 70 ℃ of water-baths and keeps 13h, pH to 4.6 is transferred with HCl in the cooling back, and the centrifugal 15min of 4000r/min goes supernatant liquor to precipitate then.
The precipitation that previous step is obtained adds 300mL distilled water and evenly suspends, heated and boiled 10min then, cooling, the centrifugal 10min of 4000r/min, remove supernatant liquor, so repeat twice, the precipitation that obtains is dewatered at twice with the 300mL dehydrated alcohol, dewater at twice with the 300mL anhydrous diethyl ether again, air-dry under 38 ℃ of conditions of gained material, obtain light gray-white product 5.40g, entrust the Guangdong Provincial Academy Of Agricultural Sciences Veterinary Institute to carry out the infared spectrum analysis, the result shows that its infrared absorption pattern (see figure 1) is close with standard beta-glucan (see figure 2), and the characteristic peak that has proves that its glycosidic link is β-(1,3) configuration, product mainly contains β-(1,3) dextran, and do not have the mannosans absorption peak, show not have mannosans.
Embodiment 2
Get fresh beer yeast thalline 300g, 0.5% papain solution with 1L suspends, keep hydrolysis 12h in 60 ℃ of waters bath with thermostatic control, and stir in the hydrolytic process discontinuous, finish the posthydrolysis liquid cooling but, the centrifugal 10min of 4000r/min removes supernatant, precipitation distilled water centrifuge washing 2 times obtain pure yeast cells wall.
Is that the NaOH solution of 0.70mol/L evenly suspends with pure yeast cells wall with 1000mL concentration, heated and boiled keeps 18min, the centrifugal 15min of cooling back 3000r/min, remove supernatant liquor, precipitation is that the NaOH solution of 0.70mol/L evenly suspends with 1000mL concentration again, heated and boiled maintenance 18min, be cooled in 65 ℃ of water-baths and keep 18h, cooling is transferred pH to 4.0 with HCl, and the centrifugal 15min of 3000r/min goes supernatant liquor to precipitate then.
The precipitation that previous step is obtained adds 300mL distilled water and evenly suspends, heated and boiled 8min then, cooling, the centrifugal 15min of 3000r/min, remove supernatant liquor, so repeat twice, the precipitation lyophilize that obtains obtains light gray-white product 5.8g, entrusts the Guangdong Provincial Academy Of Agricultural Sciences Veterinary Institute to carry out the infared spectrum analysis, and the result shows that its infrared absorption pattern is close with the standard beta-glucan, the characteristic peak that has proves that its glycosidic link is β-(1,3) configuration, product mainly contain β-(1,3) dextran, and do not have the mannosans absorption peak, show not have mannosans.
Embodiment 3
Get dry bread yeast powder 100g, evenly suspend with the NaOH solution 1000ml of 1mol/L, 90 ℃ stir down in self-dissolving reaction 3 hours, the centrifugal 15min of reaction solution cooling back 4000r/min.Precipitation is that the NaOH solution of 0.80mol/L evenly suspends with 1000mL concentration, heated and boiled keeps 20min, the centrifugal 10min of cooling back 4500r/min removes supernatant liquor, obtains precipitation, precipitation 1000mL concentration is that the NaOH solution of 0.80mol/L evenly suspends, heated and boiled keeps 20min, is cooled in 80 ℃ of water-baths and keeps 12h, cooling, transfer pH to 5.0 with HCl, the centrifugal 15min of 4500r/min goes supernatant liquor to precipitate then.
The precipitation that previous step is obtained adds 300mL distilled water and evenly suspends, heated and boiled 15min then, cooling, the centrifugal 10min of 4500r/min, remove supernatant liquor, so repeat twice, the precipitation that obtains obtains light gray-white product 5.88g with vacuum-drying, entrusts the Guangdong Provincial Academy Of Agricultural Sciences Veterinary Institute to carry out the infared spectrum analysis, and the result shows that its infrared absorption pattern is close with the standard beta-glucan, the characteristic peak that has proves that its glycosidic link is β-(1,3) configuration, product mainly contain β-(1,3) dextran, and do not have the mannosans absorption peak, show not have mannosans.
Claims (3)
1. the preparation method of the insoluble beta-glucan of alkali, its feature comprises the steps:
(1) yeast cells wall is evenly suspended with 0.70～0.80mol/L NaOH solution, heated and boiled keeps 15～20min, cooling, and 3000～4500r/min is centrifugal, and the supernatant that goes obtains precipitation;
(2) precipitation that step (1) is obtained evenly suspends with 0.70～0.80mol/L NaOH solution, heated and boiled keeps 15～20min, is cooled to 65～80 ℃ again, and constant temperature keeps 12～18h, the cooling back transfers the centrifugal supernatant that goes of pH to 4.0～5.0,3000～4500r/min to obtain precipitation with HCl;
(3) after the precipitation that step (2) is obtained evenly suspends with distilled water, boil 8～15min, 3000～4500r/min is centrifugal, and the supernatant that goes obtains precipitation, and this process repeats 2～3 times, removes moisture, obtains product.
2. according to the preparation method of the insoluble beta-glucan of a kind of alkali of claim 1, it is characterized in that the described yeast cells wall of step (1) is by fresh yeast thalline or dried yeast powder are suspended again, making cell rupture remove inclusion after self-dissolving or the enzyme-added processing obtains, perhaps directly adopt the yeast slag after yeast extracts inclusion, the precipitation described in the step (3) adopts vacuum-drying, lyophilize or with dehydrated alcohol, the anhydrous diethyl ether gradation air-dry then moisture of removing that dewaters.
3. according to the preparation method of the insoluble beta-glucan of a kind of alkali of claim 2, it is characterized in that the described fresh yeast thalline of step (1) is bread yeast (Baking yeast) or cereuisiae fermentum (Brewing yeast), described yeast cells wall is removed residual cell content 1～2 time with the distilled water centrifuge washing, adopts lyophilize to remove moisture in the step (3).
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| CN2007100316358A CN101161686B (en) | 2007-11-23 | 2007-11-23 | Method for preparing immunopotentiator beta-dextran |
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| CN2007100316358A CN101161686B (en) | 2007-11-23 | 2007-11-23 | Method for preparing immunopotentiator beta-dextran |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101548674B (en) * | 2009-05-15 | 2013-08-21 | 山西省农业科学院旱地农业研究中心 | Microorganism drought-resisting inducer and preparing method thereof |
| CN105646730A (en) * | 2014-11-12 | 2016-06-08 | 中国科学院天津工业生物技术研究所 | Method for extracting beta-1,3-D-glucan from cell walls of fungi |
| CN112760346A (en) * | 2020-12-29 | 2021-05-07 | 唐山拓普生物科技有限公司 | Method for extracting yeast cell wall polysaccharide with high immunocompetence |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1583802A (en) * | 2004-06-02 | 2005-02-23 | 中国农业大学 | Method for extracting beta-1,3-dextran |
| CN101012468A (en) * | 2007-02-07 | 2007-08-08 | 天津科技大学 | Yeast glucans extraction process |
| CN101020915A (en) * | 2007-03-07 | 2007-08-22 | 中国农业科学院农产品加工研究所 | Process of preparing yeast beta-glucosan |
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2007
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101548674B (en) * | 2009-05-15 | 2013-08-21 | 山西省农业科学院旱地农业研究中心 | Microorganism drought-resisting inducer and preparing method thereof |
| CN105646730A (en) * | 2014-11-12 | 2016-06-08 | 中国科学院天津工业生物技术研究所 | Method for extracting beta-1,3-D-glucan from cell walls of fungi |
| CN112760346A (en) * | 2020-12-29 | 2021-05-07 | 唐山拓普生物科技有限公司 | Method for extracting yeast cell wall polysaccharide with high immunocompetence |
| CN112760346B (en) * | 2020-12-29 | 2022-09-09 | 唐山拓普生物科技有限公司 | Method for extracting yeast cell wall polysaccharide with high immunocompetence |
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